CN117155126B

CN117155126B - Terminal device and control method

Info

Publication number: CN117155126B
Application number: CN202310293367.6A
Authority: CN
Inventors: 段杨森; 安奇; 张昭阳
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2023-03-14
Filing date: 2023-03-14
Publication date: 2024-06-25
Anticipated expiration: 2043-03-14
Also published as: CN117155126A

Abstract

The embodiment of the application provides terminal equipment and a control method, and relates to the technical field of terminals. The voltage reducing circuit of the terminal equipment is used for transmitting the electric energy output by the first power supply module of the terminal equipment to the load of the terminal equipment when the terminal equipment is in a first state, and controlling the first switch to be in a conducting state by utilizing the voltage of the bootstrap capacitor; or the first switch is in a cut-off state when the terminal equipment is in the second state; at a first moment, the terminal equipment is in a second state, the voltage value of the bootstrap capacitor is smaller than or equal to a preset value, and the terminal equipment is controlled to charge the bootstrap capacitor; at a third moment, the terminal equipment is in a first state, the voltage value of the bootstrap capacitor is smaller than or equal to a preset value, the second switch is in a conducting state, and the terminal equipment is controlled to charge the bootstrap capacitor. In this way, the frequency of the bootstrap capacitor charging is reduced, and the power loss is reduced.

Description

Terminal device and control method

Technical Field

The application relates to the technical field of terminals, in particular to terminal equipment and a control method.

Background

The terminal device is provided with a step-down circuit, which may be a Buck circuit. The Buck circuit comprises a first switching tube (also called an upper MOS tube), a second switching tube (also called a lower MOS tube) and a bootstrap capacitor, wherein the upper MOS tube is positioned between the power module and the load, and the bootstrap capacitor can supply power to the grid electrode of the upper MOS tube, so that the upper MOS tube is in a conducting state. In order to enable the bootstrap capacitor to provide sufficient voltage for the upper MOS transistor, the terminal device needs to charge the bootstrap capacitor.

In some implementations, the terminal device charges the bootstrap capacitor by controlling a switch between the power supply and the bootstrap capacitor to conduct. When the terminal equipment is in a standby (idle) state, the terminal equipment controls the switch to be periodically conducted to charge the bootstrap capacitor. When the terminal equipment is in an active state and the lower MOS tube is conducted, the terminal equipment controls the switch to be conducted so as to charge the bootstrap capacitor.

However, in the above implementation, power consumption of the terminal device may be large.

Disclosure of Invention

The embodiment of the application provides terminal equipment and a control method, which can reduce the times of charging bootstrap capacitors in a voltage reduction circuit and reduce the power loss of the terminal equipment.

In a first aspect, an embodiment of the present application provides a terminal device, where the terminal device includes a voltage step-down circuit, and the voltage step-down circuit includes a bootstrap capacitor, a first switch, and a second switch; the voltage reducing circuit is used for transmitting the electric energy output by the first power supply module of the terminal equipment to the load of the terminal equipment when the terminal equipment is in the first state and the first switch and the second switch are alternately in the conducting state; or when the terminal equipment is in the second state, the first switch is in the cut-off state, and the electric energy output by the first power supply module is not transmitted to the load; the first state is a state that the first power module needs to supply power to the load, and the second state is a state that the first power module does not need to supply power to the load; the step-down circuit is also used for controlling the first switch to be in a conducting state by utilizing the voltage of the bootstrap capacitor; at a first moment, the terminal equipment is in a second state, the voltage value of the bootstrap capacitor is smaller than or equal to a preset value, and the terminal equipment is controlled to charge the bootstrap capacitor; at a second moment, the terminal equipment is in a first state, the voltage value of the bootstrap capacitor is larger than a preset value, and the terminal equipment is controlled not to charge the bootstrap capacitor; at a third moment, the terminal equipment is in a first state, the voltage value of the bootstrap capacitor is smaller than or equal to a preset value, the second switch is in a conducting state, and the terminal equipment is controlled to charge the bootstrap capacitor.

Therefore, when the first power supply module is not needed to supply power to the load, the terminal equipment can control to charge the bootstrap capacitor when the voltage value of the bootstrap capacitor is reduced to be smaller than or equal to a preset value, the preset value can be the voltage value needed by the first switch to be conducted, and the times of charging the bootstrap capacitor can be reduced. And when the first power supply module is required to supply power to the load, if the voltage value of the bootstrap capacitor is reduced to be smaller than or equal to a preset value, the terminal equipment can charge the bootstrap capacitor in a gap where the second switch is conducted, so that the number of times of charging the bootstrap capacitor can be reduced, and the power loss of the terminal equipment is smaller.

In one possible implementation, the step-down circuit includes a detection module and a third switch; the positive electrode of the third switch is connected with the second power module of the terminal equipment, the negative electrode of the third switch is connected with one end of the bootstrap capacitor, and the input end of the detection module is connected with one end of the bootstrap capacitor; the detection module is used for outputting a first signal when the terminal equipment is in a first state, the voltage value of the bootstrap capacitor is detected to be smaller than or equal to a preset value, and the second switch is in a conducting state; or the terminal equipment is used for outputting a second signal when the voltage value of the bootstrap capacitor is detected to be smaller than or equal to a preset value in the second state; the first signal and the second signal are used for controlling the bootstrap capacitor to be charged; the third switch is used for transmitting the electric energy of the second power supply module to the bootstrap capacitor to charge the bootstrap capacitor when the third switch is in a conducting state; the duration of the third switch in the on state is less than or equal to the preset duration. Therefore, the terminal equipment can control the third switch to be in a conducting state according to the signal output by the detection module, and the accuracy of charging required by determining the bootstrap capacitor is improved.

In one possible implementation, the detection module includes a comparator; the first input end of the comparator is connected with one end of the bootstrap capacitor, the second input end of the comparator inputs voltage with a preset value, the power end of the comparator is connected with the second power module of the terminal equipment, and the grounding end of the comparator is grounded; and the comparator is used for comparing the voltage value of the bootstrap capacitor with a preset value, and outputting a second signal through the output end of the comparator when the voltage value of the bootstrap capacitor is smaller than or equal to the preset value. In this way, the voltage value of the bootstrap capacitor can be compared with a preset value by the comparator to determine whether the bootstrap capacitor needs to be charged.

In a possible implementation, the terminal device is in a second state, and the terminal device controls to charge the bootstrap capacitor, including: the terminal equipment receives the second signal and controls the third switch to be in a conducting state, and the second power supply module charges the bootstrap capacitor through the third switch. In this way, when the terminal equipment receives the second signal, the bootstrap capacitor is controlled to be charged, so that the frequency of charging the bootstrap capacitor can be reduced, and the power consumption of the terminal equipment is reduced.

In a possible implementation, the detection module further includes an and gate circuit and a fourth switch; the first input end of the AND gate circuit is connected with the output end of the comparator, the second input end of the AND gate circuit is connected with the control end of the second switch, and one end of the fourth switch is connected with the output end of the comparator; the AND gate circuit is used for outputting the first signal through the output end of the AND gate circuit when the second signal and the third signal are received; the third signal is a signal for controlling the second switch to be in a conducting state; and the fourth switch is used for being in an off state when the terminal equipment is in the first state or being in an on state when the terminal equipment is in the second state and transmitting a first signal of the comparator. In this way, the terminal equipment can control the on and off of the fourth switch, so that when the terminal equipment is in the first state, the second signal output by the comparator can be input into the AND gate circuit, and when the terminal equipment is in the second state, the second signal output by the comparator cannot be input into the AND gate circuit, and therefore, whether the bootstrap capacitor needs to be charged or not can be judged through the detection module in both states of the terminal equipment, and the compatibility of the detection module is improved.

In a possible implementation, the terminal device is in a first state, and the terminal device controls charging of the bootstrap capacitor, including: the terminal equipment is in a first state, the terminal equipment controls the fourth switch to be in a cut-off state, the terminal equipment controls the third switch to be in a conduction state based on the first signal, and the second power supply module charges the bootstrap capacitor through the third switch. Thus, when the terminal device is in the first state, the bootstrap capacitor is controlled to be charged when the condition is determined to be met, so that the frequency of charging the bootstrap capacitor can be reduced, and the power consumption of the terminal device can be reduced.

In a possible implementation, the step-down circuit further includes a first driver, a second driver and an inductor, wherein a first end of the first driver is connected with one end of the bootstrap capacitor, a second end of the first driver is connected with the other end of the bootstrap capacitor, a third end of the first driver is connected with a control end of the first switch, a first end of the second driver is connected with the second power supply module, a second end of the second driver is grounded, and a third end of the second driver is connected with a control end of the second switch; the positive electrode of the first switch is connected with the first power supply module, the negative electrode of the first switch is respectively connected with the positive electrode of the second switch and one end of the inductor, the positive electrode of the second switch is respectively connected with the other end of the bootstrap capacitor and one end of the inductor, and the negative electrode of the second switch is grounded; the first driver is used for driving the first switch to be in a conducting state by utilizing the voltage provided by the bootstrap capacitor when a first driving signal of the terminal equipment is received, or driving the first switch to be in a cut-off state when a second driving signal of the terminal equipment is received; and the second driver is used for driving the second switch to be in an on state by using the voltage provided by the second power supply module when receiving the third driving signal of the terminal equipment or driving the second switch to be in an off state when receiving the fourth driving signal of the terminal equipment. In this way, the terminal device can drive the first switch through the first driver and drive the second switch through the second driver, so that the accuracy of controlling the on and off of the first switch and the second switch is improved.

In a possible implementation, the voltage reduction circuit further includes a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor; one end of the first resistor is connected with the third end of the first driver, the other end of the first resistor is connected with the negative electrode of the first switch tube, one end of the second resistor is connected with the third end of the second driver, the other end of the second resistor is grounded, one end of the third resistor is connected with the second power module, the other end of the third resistor is connected with one end of the third capacitor, the other end of the third capacitor is grounded, one end of the first capacitor is connected with the first power supply, the other end of the first capacitor is grounded, one end of the second capacitor is respectively connected with the other end of the inductor and the load, the other end of the second capacitor is grounded, one end of the fourth capacitor is connected with the second power module, and the other end of the fourth capacitor is grounded.

In a second aspect, an embodiment of the present application provides a control method, which is applied to a terminal device in any one of the first aspect and any one of the possible implementation manners of the first aspect, where the method includes:

When the terminal equipment is in a first state, a first switch and a second switch in a voltage reduction circuit of the terminal equipment are alternately in a conducting state, the voltage reduction circuit transmits electric energy output by a first power supply module of the terminal equipment to a load of the terminal equipment, and when the voltage value of the bootstrap capacitor is smaller than or equal to a preset value and the second switch is in the conducting state, the terminal equipment is controlled to charge the bootstrap capacitor; the first state is a state that the first power module needs to supply power to the load; when the terminal equipment is in the second state, a first switch in a voltage reducing circuit of the terminal equipment is in a cut-off state, the voltage reducing circuit does not transmit electric energy output by a first power supply module of the terminal equipment to a load of the terminal equipment, and when the voltage value of the bootstrap capacitor is smaller than or equal to a preset value, the terminal equipment is controlled to charge the bootstrap capacitor; the second state is a state in which the first power module is not required to power the load.

In a possible implementation, when the terminal device is in the second state, the terminal device controls charging of the bootstrap capacitor, including: when the terminal equipment is in a second state and the terminal equipment receives a second signal output by the detection module of the voltage reduction circuit, the terminal equipment controls a third switch in the voltage reduction circuit to be in a conducting state, and a second power supply module of the terminal equipment charges a bootstrap capacitor through the third switch; the duration of the third switch in the on state is less than or equal to the preset duration.

In a possible implementation, before the terminal device receives the second signal output by the detection module of the step-down circuit, the method includes: when the comparator in the detection module detects that the voltage value of the bootstrap capacitor is smaller than or equal to a preset value, the output end of the comparator outputs a second signal.

In a possible implementation, when the terminal device is in the first state, the terminal device controls charging of the bootstrap capacitor, including: when the terminal equipment is in a first state and the terminal equipment receives a first signal output by a detection module of the voltage reduction circuit, the terminal equipment controls a third switch in the voltage reduction circuit to be in a conducting state, and a second power supply module of the terminal equipment charges a bootstrap capacitor through the third switch; the duration of the third switch in the on state is less than or equal to the preset duration.

In a possible implementation, before the terminal device receives the first signal output by the detection module of the step-down circuit, the method includes: when the comparator in the voltage reduction circuit detects that the voltage value of the bootstrap capacitor is smaller than or equal to a preset value, the output end of the comparator outputs a second signal; when the AND gate circuit in the detection module receives the second signal and the third signal, the first signal is output through the output end of the AND gate circuit; the third signal is a signal for controlling the second switch to be in a conducting state.

In a possible implementation, when the terminal device is in the first state, the method further includes: the terminal equipment controls the fourth switch of the voltage reducing circuit to be in a cut-off state; when the terminal device is in the second state, the method further comprises: the terminal device controls the fourth switch of the step-down circuit to be in a conducting state.

It should be understood that, the second aspect of the present application corresponds to the technical solution of the first aspect of the present application, and the advantages obtained by each aspect and the corresponding possible embodiments are similar, and are not repeated.

Drawings

Fig. 1 is a schematic diagram of a buck circuit according to an embodiment of the present application;

fig. 2 is a schematic diagram of a voltage step-down circuit in a terminal device according to an embodiment of the present application;

fig. 3 is a schematic diagram of a circuit for controlling charging of a bootstrap capacitor by a detection module according to an embodiment of the present application;

fig. 4 is a schematic diagram of a step-down circuit when the switch provided in the embodiment of the application is a MOS transistor;

fig. 5 is a schematic diagram of a circuit for controlling charging of a bootstrap capacitor by a detection module according to an embodiment of the present application;

Fig. 6 is a schematic diagram of a step-down circuit when the switch provided in the embodiment of the application is a MOS transistor;

Fig. 7 is a schematic diagram two of a step-down circuit in a terminal device according to an embodiment of the present application;

Fig. 8 is a timing chart of on and off of each switch in the step-down circuit according to the embodiment of the present application;

Fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application;

fig. 10 is a flow chart of a control method according to an embodiment of the present application.

Detailed Description

For purposes of clarity in describing the embodiments of the present application, the words "exemplary" or "such as" are used herein to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a-b, a-b-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.

When the terminal equipment supplies power to the load of the terminal equipment through the power supply module of the terminal equipment, the condition that the voltage required by the load is smaller than the voltage output by the power supply module may exist, and therefore a buck circuit is arranged in the terminal equipment. The buck circuit can carry out step-down processing on the voltage output by the power supply module and transmit the step-down voltage to a load.

The load of the terminal device may be, for example, a processor, a screen, or other power-consuming element of the terminal device, which is not limited in the embodiment of the present application.

The buck circuit in the terminal device can be seen in fig. 1. Fig. 1 is a schematic diagram of a buck circuit according to an embodiment of the present application.

As shown in fig. 1, the buck circuit may include a control module 10, a first driver 20, a second driver 30, a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a bootstrap capacitor CBOOT, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R1, a second resistor R2, a third resistor R3, and an inductor 901.

In fig. 1, the first switching tube Q1 and the second switching tube Q2 are N-type metal-oxide-semiconductor (N metal oxide semiconductor, NMOS tube), and the third switching tube Q3 is P-type metal-oxide-semiconductor (PMOS tube). The embodiments of the present application are described by way of example, and are not limited in any way.

The control module 10 may be used to control the on and off of the first switching tube Q1 by sending a signal to the first driver 20, may be used to control the on and off of the second switching tube Q2 by sending a signal to the second driver 30, and may be used to control the on and off of the third switching tube Q3. The bootstrap capacitor CBOOT may be used to provide the voltage required for the first switching tube Q1 to turn on.

As shown in fig. 1, a first output end of the control module 10 is connected to the gate of the third switching tube Q3, a second output end of the control module 10 is connected to the first input end of the first driver 20, and a third output end of the control module 10 is connected to the first input end of the second driver 30. The second input terminal of the first driver 20 is connected to one terminal of the bootstrap capacitor CBOOT, and the second terminal of the first driver 20 is connected to the gate of the first switching tube Q1 and one terminal of the first resistor R1, respectively. The drain electrode of the first switching tube Q1 is connected to the second power module 50, the source electrode of the first switching tube Q1 is respectively connected to the other end of the bootstrap capacitor CBOOT, the other end of the first resistor R1, the third end of the first driver 20, the drain electrode of the second switching tube Q2 and one end of the inductor 901, the other end of the inductor 901 is respectively connected to one end of the second capacitor C2 and the load 60, and the other end of the second capacitor C2 is grounded. The second input end of the second driver 30 is connected to the second power module 50, the second end of the second driver 30 is connected to the gate of the second switching tube Q2 and one end of the second resistor R2, respectively, and the third end of the second driver 30 and the other end of the second resistor R2 are grounded. The source of the third switching tube Q3 is connected to the second power module 50, and the drain of the third switching tube Q3 is connected to one end of the bootstrap capacitor CBOOT. One end of the first capacitor C1 is connected to the first power module 40, and the other end of the first capacitor C1 is grounded. One end of the third resistor R3 is connected with the second power module 50, the other end of the third resistor R3 is connected with one end of the third capacitor C3, and the other end of the third capacitor C3 is grounded. One end of the fourth capacitor C4 is connected to the second power module 50, and the other end of the fourth capacitor C4 is grounded.

Based on the circuit shown in fig. 1, the control module 10 may control the on and off of the first switching tube Q1 through the first driver 20, and the control module 10 may also control the on and off of the second switching tube Q2 through the second driver 30.

The controlling of the first switching tube Q1 in the on state by the control module 10 through the first driver 20 may include: the control module 10 sends a driving signal for turning on the first switching tube Q1 to the first driver 20, and the first driver 20 transmits the voltage input by the bootstrap capacitor CBOOT to the gate of the first switching tube Q1 based on the driving signal, where the voltage input by the bootstrap capacitor CBOOT is greater than or equal to the turn-on voltage of the first switching tube Q1, so that the first switching tube Q1 is in a turned-on state.

The controlling of the first switching tube Q1 in the off state by the control module 10 through the first driver 20 may include: the control module 10 transmits a driving signal for turning off the first switching tube Q1 to the first driver 20, and the first driver 20 stops transmitting the voltage input by the bootstrap capacitor CBOOT to the gate of the first switching tube Q1 based on the driving signal so that the first switching tube Q1 is in an off state.

The controlling of the second switching tube Q2 in the on state by the control module 10 through the second driver 30 may include: the control module 10 transmits a driving signal for turning on the second switching tube Q2 to the second driver 30, and the second driver 30 transmits a voltage of the second power input to the gate of the second switching tube Q2 based on the driving signal, the voltage of the second power input being greater than or equal to the turn-on voltage of the second switching tube Q2, so that the second switching tube Q2 is in a turned-on state.

The controlling of the second switching tube Q2 in the off state by the control module 10 through the second driver 30 may include: the control module 10 transmits a driving signal for turning off the second switching tube Q2 to the second driver 30, and the second driver 30 stops transmitting the voltage of the second power input to the gate of the second switching tube Q2 based on the driving signal so that the second switching tube Q2 is in an off state.

In the embodiment of the application, the terminal equipment is in different states, and the on and off states of the switching tube are different. When the terminal device is in a standby state (a state in which the first power module 40 is not required to supply power to the load 60, also referred to as an idle scenario), the first switching tube Q1 of the buck circuit may be in an off state, so that the first power module 40 and the load 60 are disconnected. When the terminal device is in an operation state (a state requiring the first power module 40 to supply power to the load 60, also referred to as an active scenario), the first switching tube Q1 and the second switching tube Q2 of the buck circuit are alternately turned on, so that when the first switching tube Q1 is turned on and the second switching tube Q2 is turned off, one end of the inductor 901 is connected to the first power supply, the other end is connected to the load 60, and when the first switching tube Q1 is turned off and the second switching tube Q2 is turned on, one end of the inductor 901 is grounded, and the other end is connected to the load 60. The voltage output by the inductor 901 is smaller than the voltage output by the first power module 40, so that the voltage of the first power module 40 is reduced.

Based on the circuit shown in fig. 1 and the related description, the bootstrap capacitor CBOOT in the buck circuit provides the voltage required for turning on the first switching tube Q1, and since the bootstrap capacitor CBOOT is fully charged, the voltage of the bootstrap capacitor CBOOT is gradually reduced, and when the voltage provided by the bootstrap capacitor CBOOT is smaller than the voltage required for turning on the first switching tube Q1, the first switching tube Q1 cannot be turned on, and the first power module 40 cannot supply power to the load 60 through the buck circuit. Therefore, the terminal device needs to charge the bootstrap capacitor CBOOT, so that when the first power module 40 needs to supply power to the load 60 through the buck circuit, the bootstrap capacitor CBOOT can provide the voltage required for the first switch Q1 to be turned on.

As shown in fig. 1, the control module 10 may control the third switching tube Q3 to be in a conducting state, so that the second power module 50 may charge the bootstrap capacitor CBOOT through the third switching tube Q3.

For example, the control module 10 may control the third switching tube Q3 to be in the on state for a period of time, and when the period of time is reached, the control module 10 controls the third switching tube Q3 to be in the off state.

The terminal device control to charge the bootstrap capacitor CBOOT may have the following implementation:

In some implementations, when the control module 10 detects that the terminal device is in the standby state, the control module 10 may control the third switching tube Q3 to be continuously in the on state. When the control module 10 detects that the terminal device is in the running state and the second switching tube Q2 is in the conducting state, the control module 10 may control the third switching tube Q3 to be in the conducting state, and the duration of the third switching tube Q3 in the conducting state is a certain duration.

However, in the above implementation, when the terminal device is in the standby state, the control module 10 controls to continuously charge the bootstrap capacitor CBOOT, so that when the voltage of the bootstrap capacitor CBOOT is higher, the control module 10 still controls to charge the bootstrap capacitor CBOOT, which increases the power consumption of the terminal device. When the terminal device is in an operation state, because the frequency of alternately conducting the first switching tube Q1 and the second switching tube Q2 is higher, the bootstrap capacitor CBOOT is charged in a gap where the second switching tube Q2 is conducted, and the bootstrap capacitor CBOOT is charged more frequently, there may be a case that the control module 10 still controls the bootstrap capacitor CBOOT to be charged when the voltage of the bootstrap capacitor CBOOT is higher, so that the power consumption of the terminal device is larger.

In other implementations, when the control module 10 detects that the terminal device is in the standby state, the control module 10 may control the third switching tube Q3 to be periodically turned on. When the control module 10 detects that the terminal device is in the running state and the second switching tube Q2 is in the conducting state, the control module 10 may control the third switching tube Q3 to be in the conducting state, and the duration of the third switching tube Q3 in the conducting state is a certain duration.

However, when the terminal device is in the standby state, the bootstrap capacitor CBOOT is periodically charged, and the period of charging the bootstrap capacitor CBOOT may be shorter, so that the bootstrap capacitor CBOOT is charged more frequently. When the terminal equipment is in an operation state, the bootstrap capacitor CBOOT is charged when the second switching tube Q2 is conducted due to the fact that the frequency of the first switching tube Q1 and the second switching tube Q2 which are conducted alternately is high, and therefore the bootstrap capacitor CBOOT is charged frequently. Therefore, the above implementation may have a case that when the bootstrap capacitor CBOOT voltage is higher, the control module 10 controls to charge the bootstrap capacitor CBOOT, so that the power consumption of the terminal device is greater. When the terminal device is in an operation state, the second switching tube Q2 is turned on more frequently, so that the bootstrap capacitor CBOOT is charged more frequently.

In view of this, the embodiment of the present application provides a terminal device, in which the terminal device may control to charge the bootstrap capacitor when the voltage value of the bootstrap capacitor decreases to be close to a certain value, and in addition, when the terminal device controls to charge the bootstrap capacitor, the terminal device may charge the bootstrap capacitor at a gap where the second switch of the step-down circuit is turned on. Therefore, the frequency of charging the bootstrap capacitor can be reduced, and the power loss of the terminal equipment is reduced.

In order to facilitate understanding of the terminal device provided by the embodiment of the present application, the following describes the terminal device provided by the embodiment of the present application in detail.

The terminal device of the embodiment of the application can comprise a voltage dropping circuit. Fig. 2 shows a schematic diagram of a step-down circuit in a terminal device. As shown in fig. 2, the bootstrap capacitor 90, the first switch 801, and the second switch 802 may be included in the step-down circuit of the terminal device. The step-down circuit may further include a detection module 70, a third switch 803, and an inductor 901.

The control module 10 in fig. 2 may be a controller in a step-down circuit, and may be a processor of a terminal device, which is not limited in the embodiment of the present application.

The step-down circuit may be configured to transmit the electric energy output by the first power module 40 of the terminal device to the load 60 of the terminal device when the terminal device is in the first state and the first switch 801 and the second switch 802 are alternately in the on state; or for when the terminal device is in the second state, the first switch 801 is in the off state and does not transmit the power output by the first power module 40 to the load 60.

The first state may be a state in which the first power module 40 is required to power the load 60, and the second state may be a state in which the first power module 40 is not required to power the load 60. The step-down circuit may also be used to control the first switch 801 to be in a conducting state using the voltage of the bootstrap capacitor 90.

The detection module 70 may be configured to output a first signal when the terminal device is in a first state, it is detected that the voltage value of the bootstrap capacitor 90 is less than or equal to a preset value, and the second switch 802 is in a conductive state; or when the terminal device is in the second state and the voltage value of the bootstrap capacitor 90 is detected to be less than or equal to the preset value, a second signal is output.

The preset value may be a voltage value required when the first switch 801 is turned on, or may be a voltage value greater than a voltage value required when the first switch 801 is turned on, which is not limited in the embodiment of the present application.

The third switch 803 may be configured to transfer power of the second power module 50 of the terminal device to the bootstrap capacitor 90 when the third switch 803 is in an on state, so as to charge the bootstrap capacitor 90. The duration that the third switch 803 is in the on state is less than or equal to the preset duration.

The preset duration may be, for example, a duration required for the second power module 50 to be able to fully charge the bootstrap capacitor 90 with a voltage value of 0, or may be other durations, which is not limited in the embodiment of the present application.

The control module 10 may be used to control the on and off of the first switch 801, the second switch 802, and the third switch 803. When the control module 10 is a controller in a step-down circuit, the controller may receive a pulse width modulation (pulse width modulation wave, PWM) wave transmitted by a processor of the terminal device and control on and off of the first switch 801, the second switch 802, and the third switch 803 based on the PWM wave.

As shown in fig. 2, the positive electrode of the first switch 801 is connected to the first power module 40, the negative electrode of the first switch 801 is connected to the positive electrode of the second switch 802 and one end of the inductor 901, the positive electrode of the second switch 802 is connected to the other end of the bootstrap capacitor CBOOT and one end of the inductor 901, and the negative electrode of the second switch 802 is grounded. The positive pole of the third switch 803 is connected to the second power module 50, and the negative pole of the third switch 803 is connected to one end of the bootstrap capacitor 90. One end of the detection module 70 is connected to one end of the bootstrap capacitor CBOOT.

Illustratively, when the terminal device is in the first state, the terminal device may control the first switch 801 and the second switch 802 to be alternately in the on state through the control module 10, so that the step-down circuit transmits the electric energy output by the first power module 40 of the terminal device to the load 60 of the terminal device. When the terminal device is in the second state, the terminal device may control the first switch 801 to be in the off state through the control module 10.

Illustratively, the terminal device controlling to charge the bootstrap capacitor 90 may include:

When the terminal device is in the first state, the first switch 801 and the second switch 802 are alternately turned on, the detection module 70 may detect the voltage of the bootstrap capacitor 90, and when the detection module 70 detects that the voltage value of the bootstrap capacitor 90 is less than or equal to a preset value, and the second switch 802 is in the on state, the detection module 70 may output the first signal. The terminal device may receive the first signal and control the third switch Q3 to be in a conductive state through the control module 10 based on the first signal, so that the second power module 50 charges the bootstrap capacitor 90 through the third switch 803.

When the terminal device is in the second state, the first switch 801 is in the off state, the detection module 70 may detect the voltage of the bootstrap capacitor 90, and when the detection module 70 detects that the voltage value of the bootstrap capacitor 90 is less than or equal to a preset value, the detection module 70 may output a second signal. The terminal device may receive the second signal, and control the third switch Q3 to be in a conductive state through the control module 10 based on the second signal, so that the second power module 50 charges the bootstrap capacitor 90 through the third switch 803.

In this way, when the terminal device is in the first state, the voltage value of the bootstrap capacitor 90 of the terminal device is smaller, and the gap where the second switch 802 is turned on charges the bootstrap capacitor 90, and when the terminal device is in the second state, the terminal device can charge the bootstrap capacitor 90 when the voltage value of the bootstrap capacitor 90 is smaller, so that the frequency of charging the bootstrap capacitor CBOOT can be reduced, and the power loss of the terminal device can be reduced.

It should be noted that, when the terminal device is in the second state, the second switch 802 may be in an on state or an off state, so when the terminal device is in the second state and the terminal device is controlled to charge the capacitor, the terminal device may control the second switch 802 to be in the on state through the control module 10, so that one end of the bootstrap capacitor 90 is connected to the second power module 50 through the third switch 803, and the other end is grounded through the second switch 802, thereby charging the bootstrap capacitor 90.

In the embodiment of the present application, the terminal device may control on and off of the first switch 801 and the second switch 802 through the driver.

According to the above embodiment, the terminal device may control to charge the bootstrap capacitor 90 based on the first signal output by the detection module 70, or may control to charge the bootstrap capacitor 90 based on the second signal. Next, a possible circuit will be described when the detection module 70 detects the voltage value of the bootstrap capacitor 90 and outputs the first signal or the second signal.

In one possible implementation, fig. 3 shows a schematic circuit diagram of charging a bootstrap capacitor controlled by a detection module. As shown in fig. 3, the step-down circuit may further include a first driver 20 and a second driver 30, and the detection module 70 may include a comparator 701.

The comparator 701 may be configured to compare the voltage of the bootstrap capacitor 90 with a preset value, and when the voltage of the bootstrap capacitor 90 is less than or equal to the preset value, output a second signal through an output terminal of the comparator 701.

The first driver 20 may be configured to drive the first switch 801 to be in an on state by using the voltage provided by the bootstrap capacitor 90 when the first driving signal of the terminal device is received, or to drive the first switch 801 to be in an off state when the second driving signal of the terminal device is received. The second driver 30 may be configured to drive the second switch 802 in an on state using the voltage supplied from the second power module 50 when the third driving signal of the terminal device is received, or to drive the second switch 802 in an off state when the fourth driving signal of the terminal device is received.

As shown in fig. 3, a first end of the first driver 20 is connected to one end of the bootstrap capacitor 90, a second end of the first driver 20 is connected to the other end of the bootstrap capacitor 90, a third end of the first driver 20 is connected to a control end of the first switch 801, a first end of the second driver 30 is connected to the second power module 50, a second end of the second driver 30 is grounded, and a third end of the second driver 30 is connected to a control end of the second switch 802. The second input terminal of the comparator 701 inputs a voltage of a preset value, the power supply terminal of the comparator 701 is connected to the second power supply module 50 of the terminal device, and the ground terminal of the comparator 701 is grounded.

The connection of the first switch 801, the second switch 802, the inductor 901, and the like in the step-down circuit may be referred to in the related description of fig. 2, and will not be described herein.

Illustratively, when the terminal device is in the first state, the terminal device may control the first driver 20 and the second driver 30 through the control module 10 such that the first switch 801 and the second switch 802 are alternately turned on. The first driver 20 may output a first driving signal to the control terminal of the first switch 801, and drive the first switch 801 to be in an on state by using the voltage provided by the bootstrap capacitor 90, and at the same time, the second driver 30 may output a fourth driving signal to the control terminal of the second switch 802, and drive the second switch 802 to be in an off state. After the first switch 801 is turned on for a period of time, the first driver 20 may output a second driving signal to the control end of the first switch 801 to drive the first switch 801 to be in an off state, and at the same time, the second driver 30 may output a third driving signal to the control end of the second switch 802, and drive the second switch 802 to be in a conductive state by using the voltage provided by the second power module 50, so as to realize the alternate conduction of the first switch 801 and the second switch 802.

When the first switch 801 and the second switch 802 are alternately turned on, the comparator 701 may compare the voltage value of the bootstrap capacitor 90 with a preset value, and when the voltage value of the bootstrap capacitor 90 is less than or equal to the preset value, output a second signal through an output terminal of the comparator 701. The terminal device may receive the first signal, and determine, through the control module 10, whether the second switch 802 is in a conducting state based on the second signal, and when the second switch 802 is in a conducting state, control the third switch Q3 to be in a conducting state through the control module 10, so that the second power module 50 charges the bootstrap capacitor 90 through the third switch 803.

For example, when the terminal device is in the second state, the terminal device may control the first driver 20 to output the second driving signal to the control terminal of the first switch 801 through the control module 10, so as to drive the first switch 801 to be in the off state. The comparator 701 may compare the voltage value of the bootstrap capacitor 90 with a preset value, and when the voltage value of the bootstrap capacitor 90 is less than or equal to the preset value, output a second signal through an output terminal of the comparator 701. The terminal device may receive the second signal and control the third switch 803 to be in a conductive state through the control module 10 based on the second signal, so that the second power module 50 charges the bootstrap capacitor 90 through the third switch 803.

It should be noted that, when the terminal device is in the second state, the second switch 802 may be in an on state or an off state. When the terminal device is in the second state and needs to charge the bootstrap capacitor, the terminal device needs to determine the state of the second switch 802, and if the second switch 802 is in the off state, the terminal device needs to control the second driver 30 to output a third driving signal to the control end of the second switch 802 through the control module 10, and drive the second switch 802 to be in the on state by using the voltage provided by the second power module 50.

For example, the first switch 801 and the second switch 802 in the step-down circuit may be NMOS transistors, and the third switch 803 may be PMOS transistors. Taking the first switch 801 and the second switch 802 as NMOS transistors and the third switch 803 as PMOS transistors as an example, the schematic circuit diagram corresponding to fig. 3 can be shown in fig. 4. Fig. 4 shows a schematic diagram of a step-down circuit when the switch is a MOS transistor.

As shown in fig. 4, the first switch 801 is a first switch tube Q1, the second switch 802 is a second switch tube Q2, the third switch 803 is a third switch tube Q3, and the bootstrap capacitor 90 is a bootstrap capacitor CBOOT. The connection between the elements in fig. 4 can be seen from the related description of fig. 3, and will not be described herein.

As shown in fig. 4, when the terminal device is in the first state, the first switching tube Q1 and the second switching tube Q2 are alternately turned on, the comparator 701 may compare the voltage value of the bootstrap capacitor CBOOT with a preset value, and when the voltage value of the bootstrap capacitor CBOOT is less than or equal to the preset value, a high level is output through the output terminal of the comparator 701. The terminal device may receive the high level, and determine, through the control module 10, whether the second switching tube Q2 is in a conducting state based on the high level, and when determining that the second switching tube Q2 is in the conducting state, control the third switching tube Q3 to be in the conducting state, so that the second power module 50 charges the bootstrap capacitor CBOOT through the third switching tube Q3.

As shown in fig. 4, when the terminal device is in the second state, the comparator 701 may compare the voltage value of the bootstrap capacitor CBOOT with a preset value, and when the voltage value of the bootstrap capacitor CBOOT is less than or equal to the preset value, a high level is output through the output terminal of the comparator 701. The terminal device may receive the high level, and control the third switching tube Q3 to be in a conductive state through the control module 10 based on the high level, so that the second power module 50 charges the bootstrap capacitor CBOOT through the third switching tube Q3.

In this way, when the terminal device is in the second state, the terminal device may compare the voltage value of the bootstrap capacitor CBOOT with the preset value through the comparator 701, and when the voltage value of the bootstrap capacitor CBOOT is smaller, control to charge the bootstrap capacitor CBOOT. When the terminal equipment is in the second state, the frequency for charging the bootstrap capacitor CBOOT is reduced, so that the power loss of the terminal equipment can be reduced.

In another possible implementation, fig. 5 shows a second schematic circuit diagram for controlling the charging of the bootstrap capacitor by the detection module. As shown in fig. 5, the step-down circuit may further include a first driver 20 and a second driver 30, and the detection module 70 may include a comparator 701, an and circuit 702, and a fourth switch 703.

The and circuit 702 may be configured to output the first signal through an output terminal of the and circuit 702 when the second signal and the third signal are received. The third signal may be a signal that controls the second switch 802 to be in a conductive state.

As shown in fig. 5, the output terminal of the comparator 701 is connected to a first input terminal of the and circuit 702 and one terminal of the fourth switch 703, respectively, and a second input terminal of the and circuit 702 is connected to a control terminal of the second switch 802. The connection between other elements in the circuit of fig. 5 can be described with reference to the above embodiments, and will not be described herein.

It should be noted that, the second input terminal of the and circuit 702 may also be connected to the control module 10, so that when the control module 10 controls the second switch 802 to be in the on state, the third signal is input to the and circuit 702, and the embodiment of the present application is only illustrated by way of example and not limitation in the connection manner shown in fig. 5.

In the circuit shown in fig. 5, the fourth switch 703 may be in an off state when the terminal device is in the first state, and the fourth switch 703 may be in an on state when the terminal device is in the second state. In this way, the terminal device can control whether the and circuit 702 operates by controlling the on and off of the fourth switch 703.

Illustratively, when the terminal device is in the first state, the first switch 801 and the second switch 802 are alternately turned on, and the terminal device may control the fourth switch 703 to be in the off state through the control module 10. The comparator 701 may compare the voltage value of the bootstrap capacitor CBOOT with a preset value, and when the voltage value of the bootstrap capacitor 90 is less than or equal to the preset value, the comparator 701 outputs a second signal to the and circuit 702. The and circuit 702 may obtain, through a second input terminal thereof, a signal (the signal may be a third signal) input to the second switch 802 by the second driver 30, determine whether the second switch 802 is in the on state, and when the second switch 802 is in the on state, the and circuit 702 may further receive the third signal. When the and circuit 702 receives the second signal and the third electrical signal, the and circuit 702 may output the first signal. The terminal device may receive the first signal through the control module 10 and control the third switch 803 to be in a conducting state based on the first signal, so that the second power module 50 charges the bootstrap capacitor CBOOT through the third switch 803.

Illustratively, when the terminal device is in the second state, the first switch 801 is in a conductive state, and the terminal device may control the fourth switch 703 to be in a conductive state through the control module 10. The comparator 701 may compare the voltage value of the bootstrap capacitor 90 with a preset value, and when the voltage value of the bootstrap capacitor 90 is less than or equal to the preset value, the comparator 701 may output the second signal through the fourth switch 703. The terminal device may receive the second signal through the control module 10 and control the third switch 803 to be in a conducting state based on the second signal, so that the second power module 50 charges the bootstrap capacitor CBOOT through the third switch 803.

It should be noted that, when the terminal device is in the second state and the terminal device needs to charge the bootstrap capacitor 90, the second switch 802 needs to be in the conductive state. Therefore, when the terminal device is in the second state and the terminal device receives the second signal through the control module 10, the terminal device may further determine whether the second switch 802 is in the on state through the control module 10, and if the second switch 802 is in the off state, the terminal device may control the second switch 802 to be in the on state through the control module 10 and control the third switch 803 to be in the on state, so as to charge the bootstrap capacitor 90. When the duration of the third switch 803 in the on state reaches a certain duration, the third switch 803 may be controlled to be in the off state, and the second switch 802 may be controlled to be in the off state.

The control of the on and off of the first switch 801 and the second switch 802 may be described with reference to the above embodiments, and will not be described herein.

In one possible implementation, the first switch 801 and the second switch 802 in the buck circuit may be NMOS transistors, the third switch 803 may be PMOS transistors, and the fourth switch 703 may be PMOS transistors. The switch may be any other switch element, which is not limited in the embodiment of the present application.

Taking the first switch 801 and the second switch 802 may be NMOS transistors, the third switch 803 and the fourth switch are PMOS transistors as examples, the schematic circuit diagram corresponding to fig. 5 may be shown in fig. 6. Fig. 6 shows a schematic diagram of a step-down circuit when the switch is a MOS transistor.

As shown in fig. 6, the first switch 801 is a first switch tube Q1, the second switch 802 is a second switch tube Q2, the third switch 803 is a third switch tube Q3, the fourth switch 703 is a fourth switch tube Q4, and the bootstrap capacitor 90 is a bootstrap capacitor CBOOT. The connection manner between the elements in fig. 6 can be described with reference to the above embodiments, and will not be described herein.

As shown in fig. 6, the gate of the fourth switching tube Q4 may receive the signal of the control module 10, the source of the fourth switching tube Q4 is connected to the output end of the comparator 701, and the drain of the fourth switching tube Q4 may output the signal to the control module 10.

As shown in fig. 6, when the terminal device is in the first state, the control module 10 may output a high level to the gate of the fourth switching tube Q4 such that the fourth switching tube Q4 is in the off state. The comparator 701 may compare the voltage of the bootstrap capacitor CBOOT with a preset value, and when the voltage of the bootstrap capacitor CBOOT is less than or equal to the preset value, output a high level to the and circuit 702 through the output terminal of the comparator 701. The terminal device may output a high level to the gate of the second switch 802 through the second driver 30 so that the second switch 802 is in a conductive state. Accordingly, when the and circuit 702 receives two high levels, the and circuit 702 outputs a high level. The terminal device may receive the high level output by the gate circuit, and control the third switching tube Q3 to be in a conductive state through the control module 10 based on the high level, so that the second power module 50 charges the bootstrap capacitor CBOOT through the third switch 803.

Thus, when the comparator 701, the and circuit 702, and the fourth switching tube Q4 are included in the detection module 70, the terminal device can control the on and off of the fourth switching tube Q4 based on the state of the terminal device such that a path is formed between the comparator 701 and the and circuit 702 when the terminal device is in the first state, and no path is formed between the comparator 701 and the and circuit 702 when the terminal device is in the second state. When the terminal equipment is in different states, the terminal equipment can determine whether to charge the bootstrap capacitor CBOOT or not based on different judging conditions, so that the suitability of the voltage reduction circuit is improved.

It will be appreciated that the second input terminal of the and circuit 702 in fig. 5 and 6 is connected to the third terminal of the second driver 30, so as to determine whether the second switch 802 is in the on state according to the signal input to the second switch 802 by the second driver 30. In a possible implementation, a second input terminal of the and circuit 702 may also be connected to the control module 10 (not shown in the embodiment of the present application), and the signal output by the control module 10 to the second driver 30 determines whether the second switch 802 is in the on state.

The step-down circuit of the terminal device may further include a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4. Fig. 7 is a schematic diagram of a step-down circuit in a terminal device according to an embodiment of the present application, as shown in fig. 7.

One end of the first resistor R1 is connected with the third end of the first driver 20, the other end of the first resistor R1 is connected with the negative electrode of the first switch tube Q1, one end of the second resistor R2 is connected with the third end of the second driver 30, the other end of the second resistor R2 is grounded, one end of the third resistor R3 is connected with the second power module 50, the other end of the third resistor R3 is connected with one end of the third capacitor C3, the other end of the third capacitor C3 is grounded, one end of the first capacitor C1 is connected with a first power supply, the other end of the first capacitor C1 is grounded, one end of the second capacitor C2 is connected with the other end of the inductor 901 and the load 60 respectively, the other end of the second capacitor C2 is grounded, one end of the fourth capacitor C4 is connected with the second power module 50, and the other end of the fourth capacitor C4 is grounded.

It will be appreciated that the manner of other elements in the circuit shown in fig. 7 can be described with reference to the above embodiments, and will not be described again here.

Taking the circuit shown in fig. 7 as an example, the on and off conditions that may exist for each switch in the step-down circuit when the step-down circuit is operated will be described. Fig. 8 is a timing chart of on and off of each switch in the voltage step-down circuit according to an embodiment of the present application.

In fig. 8, timing diagrams when the terminal device is in the first state and the terminal device is in the second state are shown, respectively.

The terminal device of the embodiment of the application can also be any form of electronic device, for example, the electronic device can include a handheld device with an image processing function, a vehicle-mounted device and the like. For example, some electronic devices are: a mobile phone, a tablet, a palmtop, a notebook, a mobile internet device (mobile INTERNET DEVICE, MID), a wearable device, a Virtual Reality (VR) device, an augmented reality (augmented reality, AR) device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned (SELF DRIVING), a wireless terminal in teleoperation (remote medical surgery), a wireless terminal in smart grid (SMART GRID), a wireless terminal in transportation security (transportation safety), a wireless terminal in smart city (SMART CITY), a wireless terminal in smart home (smart home), a cellular phone, a cordless phone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital assistant (personal DIGITAL ASSISTANT, PDA), a handheld device with wireless communication functionality, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a 5G network, or a future evolved land mobile network (public land mobile network), and the like, without limiting the application.

By way of example, and not limitation, in embodiments of the application, the electronic device may also be a wearable device. The wearable device can also be called as a wearable intelligent device, and is a generic name for intelligently designing daily wear by applying wearable technology and developing wearable devices, such as glasses, gloves, watches, clothes, shoes and the like. The wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also can realize a powerful function through software support, data interaction and cloud interaction. The generalized wearable intelligent device includes full functionality, large size, and may not rely on the smart phone to implement complete or partial functionality, such as: smart watches or smart glasses, etc., and focus on only certain types of application functions, and need to be used in combination with other devices, such as smart phones, for example, various smart bracelets, smart jewelry, etc. for physical sign monitoring.

In addition, in the embodiment of the application, the electronic equipment can also be terminal equipment in an internet of things (internet of things, ioT) system, and the IoT is an important component of the development of future information technology, and the main technical characteristics of the IoT are that the article is connected with a network through a communication technology, so that the man-machine interconnection and the intelligent network of the internet of things are realized.

The electronic device in the embodiment of the application may also be referred to as: a terminal device, a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, a user equipment, or the like.

In an embodiment of the present application, the electronic device or each network device includes a hardware layer, an operating system layer running on top of the hardware layer, and an application layer running on top of the operating system layer. The hardware layer includes hardware such as a central processing unit (central processing unit, CPU), a memory management unit (memory management unit, MMU), and a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processes through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address book, word processing software, instant messaging software and the like.

By way of example, fig. 9 shows a schematic structural diagram of an electronic device.

The electronic device may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (universal serial bus, USB) interface 130, a charge management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, keys 190, a motor 191, an indicator 192, a camera 193, a display 194, and a subscriber identity module (subscriber identification module, SIM) card interface 195, etc. The sensor module 180 may include a pressure sensor 180A, a gyro sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, and the like.

It should be understood that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the electronic device. In other embodiments of the application, the electronic device may include more or less components than illustrated, or certain components may be combined, or certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

The processor 110 may include one or more processing units, such as: the processor 110 may include an application processor (application processor, AP), a modem processor, a graphics processor (graphics processing unit, GPU), an image signal processor (IMAGE SIGNAL processor, ISP), a controller, a video codec, a digital signal processor (DIGITAL SIGNAL processor, DSP), a baseband processor, and/or a neural-Network Processor (NPU), etc. Wherein the different processing units may be separate devices or may be integrated in one or more processors.

The controller can generate operation control signals according to the instruction operation codes and the time sequence signals to finish the control of instruction fetching and instruction execution. By way of example, the controller may be the control module 10 in the above-described embodiments.

A memory may also be provided in the processor 110 for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may hold instructions or data that the processor 110 has just used or recycled. If the processor 110 needs to reuse the instruction or data, it can be called directly from the memory. Repeated accesses are avoided and the latency of the processor 110 is reduced, thereby improving the efficiency of the system.

In some embodiments, the processor 110 may include one or more interfaces. The interfaces may include an integrated circuit (inter-INTEGRATED CIRCUIT, I2C) interface, an integrated circuit built-in audio (inter-INTEGRATED CIRCUIT SOUND, I2S) interface, a pulse code modulation (pulse code modulation, PCM) interface, a universal asynchronous receiver transmitter (universal asynchronous receiver/transmitter, UART) interface, a mobile industry processor interface (mobile industry processor interface, MIPI), a general-purpose input/output (GPIO) interface, a subscriber identity module (subscriber identity module, SIM) interface, and/or a universal serial bus (universal serial bus, USB) interface, among others.

The I2C interface is a bi-directional synchronous serial bus comprising a serial data line (SERIAL DATA LINE, SDA) and a serial clock line (derail clock line, SCL). In some embodiments, the processor 110 may contain multiple sets of I2C buses.

The GPIO interface may be configured by software. The GPIO interface may be configured as a control signal or as a data signal. In some embodiments, a GPIO interface may be used to connect the processor 110 with the camera 193, the display 194, the wireless communication module 160, the audio module 170, the sensor module 180, and the like. The GPIO interface may also be configured as an I2C interface, an I2S interface, a UART interface, an MIPI interface, etc.

It should be understood that the connection relationship between the modules illustrated in the embodiments of the present application is only illustrative, and does not limit the structure of the electronic device. In other embodiments of the present application, the electronic device may also use different interfacing manners, or a combination of multiple interfacing manners in the foregoing embodiments.

The USB interface 130 is an interface conforming to the USB standard specification, and may specifically be a Mini USB interface, a Micro USB interface, a USB Type C interface, or the like. The USB interface 130 may be used to connect a charger to charge the electronic device 100, and may also be used to transfer data between the electronic device 100 and a peripheral device. And can also be used for connecting with a headset, and playing audio through the headset. The interface may also be used to connect other electronic devices, such as AR devices, etc.

The internal memory 121 may be used to store computer-executable program code that includes instructions. The internal memory 121 may include a storage program area and a storage data area. The storage program area may store an application program (such as a sound playing function, an image playing function, etc.) required for at least one function of the operating system, etc. The storage data area may store data created during use of the electronic device (e.g., audio data, phonebook, etc.), and so forth. In addition, the internal memory 121 may include a high-speed random access memory, and may further include a nonvolatile memory such as at least one magnetic disk storage device, a flash memory device, a universal flash memory (universal flash storage, UFS), and the like. The processor 110 performs various functional applications of the electronic device and data processing by executing instructions stored in the internal memory 121 and/or instructions stored in a memory provided in the processor. For example, the control method of the embodiment of the present application may be performed.

The charge management module 140 is configured to receive a charge input from a charger. The charger can be a wireless charger or a wired charger. In some wired charging embodiments, the charge management module 140 may receive a charging input of a wired charger through the USB interface 130. In some wireless charging embodiments, the charge management module 140 may receive wireless charging input through a wireless charging coil of the electronic device 100. The charging management module 140 may also supply power to the electronic device through the power management module 141 while charging the battery 142.

The power management module 141 is used for connecting the battery 142, and the charge management module 140 and the processor 110. The power management module 141 receives input from the battery 142 and/or the charge management module 140 to power the processor 110, the internal memory 121, the display 194, the camera 193, the wireless communication module 160, and the like. The power management module 141 may also be configured to monitor battery capacity, battery cycle number, battery health (leakage, impedance) and other parameters. In other embodiments, the power management module 141 may also be provided in the processor 110. In other embodiments, the power management module 141 and the charge management module 140 may be disposed in the same device.

The step-down circuit of the embodiment of the present application may be disposed in the charge management module 140 or the power management module 141, and the embodiment of the present application is not limited thereto.

Taking the circuit shown in fig. 7 as an example, a scenario that may exist at different moments during the operation of the step-down voltage is illustrated.

At the first moment, the terminal equipment is in a second state, the voltage value of the bootstrap capacitor CBOOT is smaller than or equal to a preset value, and the terminal equipment is controlled to charge the bootstrap capacitor CBOOT.

For example, when the terminal device is in the second state, the control module 10 may output a low level to the gate of the fourth switching tube Q4 such that the fourth switching tube Q4 is in the on state. The control module 10 may also output a low level to the gate of the first switch 801 through the first driving circuit so that the first switch 801 is in an off state.

At the first moment, the comparator 701 may compare the voltage value of the bootstrap capacitor CBOOT with a preset value, and when the comparator 701 detects that the voltage value of the bootstrap capacitor CBOOT is less than or equal to the preset value, the comparator 701 may output a high level through the fourth switching tube Q4. The terminal device receives the high level output by the fourth switching tube Q4 through the control module 10, and outputs the low level to the gate of the third switch 803 based on the high level, so that the third switch 803 is in a conducting state, and charges the bootstrap capacitor CBOOT.

It should be noted that, when the terminal device controls the third switch 803 to be in the on state, if the second switch 802 is in the off state, the terminal device may also control the second driver 30 to output a high level to the gate of the second switch 802 through the control module 10, so that the second switch 802 is in the on state, and the other end of the bootstrap capacitor CBOOT is grounded, thereby charging the bootstrap capacitor CBOOT.

At a second moment, the terminal equipment is in a first state, the voltage value of the bootstrap capacitor CBOOT is larger than a preset value, and the terminal equipment is controlled not to charge the bootstrap capacitor CBOOT.

At a third moment, the terminal device is in the first state, the voltage value of the bootstrap capacitor CBOOT is less than or equal to a preset value, and the second switch 802 is in a conducting state, and the terminal device is controlled to charge the bootstrap capacitor CBOOT.

For example, when the terminal device is in the first state, the control module 10 may output a high level to the gate of the fourth switching tube Q4 such that the fourth switching tube Q4 is in the off state. The control module 10 may also alternately control the first switch 801 and the second switch 802 to be in a conductive state.

At the fourth time, the comparator 701 may compare the voltage value of the bootstrap capacitor CBOOT with a preset value, when the comparator 701 detects that the voltage value of the bootstrap capacitor CBOOT is less than or equal to the preset value, the output terminal of the comparator 701 outputs a high level to the and circuit 702, and when the and circuit 702 receives the high level output by the comparator 701 and the high level output by the second driver 30 to the gate of the second switch 802, the output terminal of the and circuit 702 may output the high level. The terminal device receives the high level output by the output end of the and circuit 702 through the control module 10, and based on the high level, outputs the low level to the gate of the third switch 803, so that the third switch 803 is in a conducting state, and charges the bootstrap capacitor CBOOT.

It should be noted that the first time, the second time, and the third time may occur in time sequence, or may occur alternately, which is not limited by the embodiment of the present application.

For example, in the embodiment of the present application, the terminal device controlling to charge the bootstrap capacitor CBOOT may further include: when the terminal equipment is in the first state, if the voltage value of the bootstrap capacitor CBOOT is larger than a first preset value, the terminal equipment controls the bootstrap capacitor CBOOT to be charged. When the terminal device is in the second state, if the voltage value of the bootstrap capacitor CBOOT is greater than a second preset value, the terminal device controls to charge the bootstrap capacitor CBOOT.

The first preset value may be smaller than the second preset value or equal to the second preset value, which is not limited in the embodiment of the present application. When the first preset value is equal to the second preset value, the step-down circuit can be shown in fig. 7. When the first preset value is smaller than the second preset value, the terminal device may control the reference voltage of the comparator 701 to be the first preset value if the terminal device is in the first state, and may control the reference voltage of the comparator 701 to be the second preset value if the terminal device is in the second state.

Next, a control method for controlling the terminal device to charge the bootstrap capacitor CBOOT when different states correspond to different preset values will be described. A flowchart of this control method can be seen in fig. 10. Fig. 10 is a flow chart of a control method according to an embodiment of the present application.

As shown in fig. 10, the control method provided by the embodiment of the present application may include the following steps:

s1001, the terminal equipment powers on a step-down circuit.

Illustratively, powering up the buck circuit by the terminal device may control the first power module 40 and the second power module 50 to power the buck circuit for the terminal device.

S1002, the terminal equipment judges whether the terminal equipment is in a first state.

The terminal device may determine, by the control module, whether the terminal device is in the first state. If the terminal device is in the first state, the terminal device may perform steps S1003, S1004, and S1007 described below. If the terminal device is not in the first state, the terminal device may perform the following steps S1005-S1007.

S1003, the terminal equipment judges whether the voltage value of the bootstrap capacitor is smaller than or equal to a first preset value.

The terminal device may compare the voltage value of the bootstrap capacitor with the first preset value through a comparator in the circuit. Specific reference may be made to the above embodiments, and details are not repeated here.

If the voltage value of the bootstrap capacitor is less than or equal to the first preset value, the terminal device may execute step S1004 described below. If the voltage value of the bootstrap capacitor is greater than the first preset value, the terminal device may execute the step S1002 described above.

S1004, the terminal equipment judges whether the second switch is in a conducting state.

The terminal device may determine whether the second switch is in the on state through the and circuit in the circuit, which may be described in the above embodiment, and will not be described herein.

If the second switch is in the on state, the terminal device may perform step S1007 described below. If the second switch 802 is not in the on state, the terminal device may continue to execute step S1004.

S1005, the terminal equipment judges whether the terminal equipment is in a second state.

The terminal device may determine, by the control module, whether the terminal device is in the second state. If the terminal device is in the second state, the terminal device may perform steps S1006 and S1007 described below. If the terminal device is not in the second state, the terminal device may perform step S1002 described above.

S1006, the terminal equipment judges whether the voltage value of the bootstrap capacitor is smaller than or equal to a second preset value.

The terminal device may compare the voltage value of the bootstrap capacitor with a second preset value through a comparator in the circuit. Specific reference may be made to the above embodiments, and details are not repeated here.

If the voltage value of the bootstrap capacitor is greater than the second preset value, the terminal device may execute the step S1002 described above. If the voltage value of the bootstrap capacitor is less than or equal to the second preset value, the terminal device may perform, and the terminal device may further need to determine whether the second switch is in the on state, and when the second switch is in the on state, may perform step S1007 described below, and when the second switch is in the off state, the terminal device may control the second switch to be in the on state, and perform step S1007 described below.

And S1007, the terminal equipment controls the third switch to be conducted so as to charge the bootstrap capacitor.

The terminal device may control the third switch to be in the on state within a preset time period, and may control the third switch to be in the off state when the preset time period is reached. The manner in which the terminal device controls the on and off of the third switch may be described in the above embodiments, and will not be described herein.

It should be noted that, when the terminal device is in the second state to charge the bootstrap capacitor, and the terminal device controls the second switch 802 to be turned from the off state to the on state, if the bootstrap capacitor is charged, the terminal device controls the third switch to be in the off state and may also control the second switch to be in the off state.

Therefore, the terminal equipment can charge the bootstrap capacitor when the bootstrap capacitor needs to be charged, the frequency of charging the bootstrap capacitor is reduced, and the power consumption of the terminal equipment is reduced.

In summary, the circuit and the control method for charging the capacitor by the terminal device in the embodiment of the application may be applied to other devices besides the terminal device, for example, devices including a switching power supply, a power electronic power module, a semiconductor power chip, etc., and the embodiment of the application is described by taking the application to the terminal device as an example, but is not limited thereto.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processing unit of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processing unit of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. It should be noted that, the user information (including but not limited to user equipment information, user personal information, etc.) and the data (including but not limited to data for analysis, stored data, presented data, etc.) related to the present application are information and data authorized by the user or fully authorized by each party, and the collection, use and processing of the related data need to comply with the related laws and regulations and standards of the related country and region, and provide corresponding operation entries for the user to select authorization or rejection.

Claims

1. The terminal equipment is characterized by comprising a voltage reduction circuit, wherein the voltage reduction circuit comprises a bootstrap capacitor, a first switch and a second switch;

The step-down circuit is used for transmitting the electric energy output by the first power supply module of the terminal equipment to the load of the terminal equipment when the terminal equipment is in a first state and the first switch and the second switch are alternately in a conducting state; or when the terminal equipment is in the second state, the first switch is in the cut-off state and does not transmit the electric energy output by the first power supply module to the load; the first state is a state in which the first power module needs to supply power to the load, and the second state is a state in which the first power module does not need to supply power to the load;

The step-down circuit is further configured to control the first switch to be in a conducting state by using the voltage of the bootstrap capacitor;

At a first moment, the terminal equipment is in the second state, the voltage value of the bootstrap capacitor is smaller than or equal to a preset value, the second switch is in a conducting state, and the terminal equipment is controlled to charge the bootstrap capacitor;

at a second moment, the terminal equipment is in the first state, the voltage value of the bootstrap capacitor is larger than the preset value, and the terminal equipment controls not to charge the bootstrap capacitor;

At a third moment, the terminal equipment is in the first state, the voltage value of the bootstrap capacitor is smaller than or equal to the preset value, the second switch is in a conducting state, and the terminal equipment controls the bootstrap capacitor to be charged.

2. The terminal device of claim 1, wherein the step-down circuit comprises a detection module and a third switch;

The positive electrode of the third switch is connected with the second power module of the terminal equipment, the negative electrode of the third switch is connected with one end of the bootstrap capacitor, and the input end of the detection module is connected with one end of the bootstrap capacitor;

The detection module is used for outputting a first signal when the terminal equipment is in the first state, the voltage value of the bootstrap capacitor is detected to be smaller than or equal to the preset value, and the second switch is in the conducting state; or the terminal equipment is used for outputting a second signal when the voltage value of the bootstrap capacitor is detected to be smaller than or equal to the preset value in the second state; the first signal and the second signal are both used for controlling the bootstrap capacitor to be charged;

The third switch is configured to transmit, when the third switch is in a conducting state, electrical energy of the second power module to the bootstrap capacitor, and charge the bootstrap capacitor; the duration of the third switch in the on state is less than or equal to the preset duration.

3. The terminal device of claim 2, wherein the detection module comprises a comparator;

The first input end of the comparator is connected with one end of the bootstrap capacitor, the second input end of the comparator inputs voltage with a preset value, the power end of the comparator is connected with the second power module of the terminal equipment, and the grounding end of the comparator is grounded;

The comparator is used for comparing the voltage value of the bootstrap capacitor with the preset value, and outputting the second signal through the output end of the comparator when the voltage value of the bootstrap capacitor is smaller than or equal to the preset value.

4. A terminal device according to claim 3, wherein the terminal device is in the second state, the terminal device controlling charging of the bootstrap capacitor, comprising:

The terminal equipment receives the second signal and controls the third switch to be in a conducting state, and the second power supply module charges the bootstrap capacitor through the third switch.

5. The terminal device according to claim 3 or 4, wherein the detection module further comprises an and circuit and a fourth switch;

the first input end of the AND gate circuit is connected with the output end of the comparator, the second input end of the AND gate circuit is connected with the control end of the second switch, and one end of the fourth switch is connected with the output end of the comparator;

the AND gate circuit is used for outputting a first signal through the output end of the AND gate circuit when the second signal and the third signal are received; the third signal is a signal for controlling the second switch to be in a conducting state;

The fourth switch is configured to be in an off state when the terminal device is in the first state, or be in an on state when the terminal device is in the second state, and transmit the first signal of the comparator.

6. The terminal device of claim 5, wherein the terminal device is in the first state, the terminal device controlling charging of the bootstrap capacitor, comprising:

the terminal equipment is in the first state, the terminal equipment controls the fourth switch to be in an off state, the terminal equipment controls the third switch to be in an on state based on the first signal, and the second power supply module charges the bootstrap capacitor through the third switch.

7. The terminal device of any of claims 1-4, 6, wherein the step-down circuit further comprises a first driver, a second driver, and an inductor,

The first end of the first driver is connected with one end of the bootstrap capacitor, the second end of the first driver is connected with the other end of the bootstrap capacitor, the third end of the first driver is connected with the control end of the first switch, the first end of the second driver is connected with the second power supply module, the second end of the second driver is grounded, and the third end of the second driver is connected with the control end of the second switch;

The positive electrode of the first switch is connected with the first power supply module, the negative electrode of the first switch is respectively connected with the positive electrode of the second switch and one end of the inductor, the positive electrode of the second switch is respectively connected with the other end of the bootstrap capacitor and one end of the inductor, and the negative electrode of the second switch is grounded;

The first driver is configured to drive the first switch to be in an on state by using a voltage provided by the bootstrap capacitor when a first driving signal of the terminal device is received, or drive the first switch to be in an off state when a second driving signal of the terminal device is received;

the second driver is configured to drive the second switch to be in an on state by using the voltage provided by the second power module when the third driving signal of the terminal device is received, or drive the second switch to be in an off state when the fourth driving signal of the terminal device is received.

8. The terminal device of claim 7, wherein the voltage step-down circuit further comprises a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor;

one end of the first resistor is connected with the third end of the first driver, the other end of the first resistor is connected with the negative electrode of the first switch tube, one end of the second resistor is connected with the third end of the second driver, the other end of the second resistor is grounded, one end of the third resistor is connected with the second power supply module, the other end of the third resistor is connected with one end of the third capacitor, the other end of the third capacitor is grounded, one end of the first capacitor is connected with a first power supply, the other end of the first capacitor is grounded, one end of the second capacitor is respectively connected with the other end of the inductor and the load, the other end of the second capacitor is grounded, one end of the fourth capacitor is connected with the second power supply module, and the other end of the fourth capacitor is grounded.

9. A control method, characterized in that it is applied to a terminal device according to any one of claims 1-8, the method comprising:

When the terminal equipment is in the first state, a first switch and a second switch in a voltage reduction circuit of the terminal equipment are alternately in a conducting state, the voltage reduction circuit transmits electric energy output by a first power supply module of the terminal equipment to a load of the terminal equipment, and when the voltage value of the bootstrap capacitor is smaller than or equal to a preset value and the second switch is in the conducting state, the terminal equipment controls the bootstrap capacitor to be charged; the first state is a state in which the first power module needs to supply power to the load;

When the terminal equipment is in the second state, a first switch in a voltage reduction circuit of the terminal equipment is in an off state, the voltage reduction circuit does not transmit electric energy output by a first power supply module of the terminal equipment to a load of the terminal equipment, and when the voltage value of the bootstrap capacitor is smaller than or equal to a preset value, the terminal equipment controls the bootstrap capacitor to be charged; the second state is a state in which the first power module is not required to power the load.

10. The method of claim 9, wherein the terminal device controls charging the bootstrap capacitor when the terminal device is in the second state, comprising:

When the terminal equipment is in the second state and the terminal equipment receives a second signal output by the detection module of the voltage reduction circuit, the terminal equipment controls a third switch in the voltage reduction circuit to be in a conducting state, and a second power supply module of the terminal equipment charges the bootstrap capacitor through the third switch; the duration of the third switch in the on state is less than or equal to the preset duration.

11. The method of claim 10, wherein before the terminal device receives the second signal output by the detection module of the step-down circuit, the method comprises:

When the comparator in the detection module detects that the voltage value of the bootstrap capacitor is smaller than or equal to the preset value, the output end of the comparator outputs the second signal.

12. The method of claim 9, wherein the terminal device controls charging the bootstrap capacitor when the terminal device is in the first state, comprising:

When the terminal equipment is in the first state and the terminal equipment receives a first signal output by a detection module of the voltage reduction circuit, the terminal equipment controls a third switch in the voltage reduction circuit to be in a conducting state, and a second power supply module of the terminal equipment charges the bootstrap capacitor through the third switch; the duration of the third switch in the on state is less than or equal to the preset duration.

13. The method of claim 12, wherein before the terminal device receives the first signal output by the detection module of the step-down circuit, the method comprises:

when the comparator in the voltage reduction circuit detects that the voltage value of the bootstrap capacitor is smaller than or equal to the preset value, the output end of the comparator outputs a second signal;

When an AND gate circuit in the detection module receives the second signal and the third signal, the first signal is output through an output end of the AND gate circuit; the third signal is a signal for controlling the second switch to be in a conducting state.

14. The method of claim 9, wherein when the terminal device is in the first state, further comprising:

The terminal equipment controls a fourth switch of the voltage reduction circuit to be in a cut-off state;

when the terminal device is in the second state, the method further comprises:

And the terminal equipment controls the fourth switch of the voltage reduction circuit to be in a conducting state.